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Medical Nutrition in Cancer Care

Why is nutrition important when you have cancer?

Cancer treatment, particularly chemotherapy and radiotherapy, can affect what a patient is able to eat and/or drink, and how well their body absorbs and uses the nutrients it gets from food. In addition, cancer itself can raise the body’s metabolic rate so that it is burning off muscle (‘lean body mass’) at a much higher rate than normal, a condition known as ‘cachexia’1. Together, these factors cause many patients (between 30% and 80%) to lose weight as they progress through their cancer journey, from diagnosis, through to treatment and recovery. This weight loss can have significant and negative effect on the health of a patient, being associated with increased complications, more rapid disease progression, and even delaying or leading to suboptimal treatment – with implications for rates of survival3-5.

It is important that cancer patients understand the implications of weight loss – and are armed with the nutritional information necessary to help them regain and/or maintain their bodyweight.

Is there a cancer diet?

Whilst there are no direct cancer-causing foods or specific cancer fighting foods (‘anti-cancer foods’), it is important to obtain enough of particular nutrients to support the body during cancer treatment. Guidelines suggest that cancer patients should consume twice the amount of protein as a healthy person, to rebuild muscle strength6. Energy, in the form of calories, is also important6. Cancer patients also need enough micronutrients, which are key for the normal functioning of the body; for example, Vitamin D, where Vitamin D deficiency is common amongst cancer patients7,8. However, in general, people tend to eat less when they are not feeling well. Because of the effects of cancer and its treatment, it can be difficult to get enough of the right nutrition from a normal diet alone to keep the body as strong as it needs to be. At this point, a healthcare team may recommend the use of medical nutrition.

What is medical nutrition?

Also known as oral nutritional supplements (ONS), medical nutrition is specially designed foods and drinks that help people with disease-related malnutrition meet their nutritional needs. Classified as ‘foods for special medical purposes’, medical nutrition must be used under the supervision of a qualified healthcare professional.

Designed to help boost nutritional intake, they should be taken in addition to what a patient is able to eat and drink rather than replacing ordinary foods and drinks. Medical nutrition is available in a range of different flavours and formats and in a range of different nutrient compositions. This means that cancer patients can benefit from a medical nutrition regime tailored not only to their nutritional needs but also to their taste and format preferences.

If a patient is unable to eat at all, some variants of medical nutrition can, when taken in sufficient quantities, be used as a sole source of nutrition as they contain all the nutrients a body needs to function. Medical nutrition can also be administered via a tube to the stomach (enterally) for those who cannot consume food and drinks via the mouth.

What types of medical nutrition are available?

Adherence to the medical nutrition regimen recommended by a healthcare professional is important so that a patient can feel the full benefits of their nutritional support. For this purpose, there are many different flavours and formats of medical nutrition so patients can select those they like best and can keep their intake varies to avoid format fatigue.

Medical nutrition support cancer patients meet their nutritional needs

Boosting nutritional intake via medical nutritional supplements has been shown in clinical trials to benefit cancer patients in several different ways, for example:

Medical nutrition: how much and for how long?

Every patient is different and has different nutritional needs, depending on the severity of their weight loss and/or cancer cachexia. Prescriptions or recommendations for medical nutrition are often for between 1 and 3 units or bottles a day but this varies depending on the patient’s needs.

It is also important to understand that medical nutrition doesn’t work overnight – it takes time to rebuild the strength lost through the effects of cancer. The healthcare professional managing the nutritional needs of a cancer patient should be able to advise for how long they need to take medical nutrition. It can be anything from a few weeks to a few months, or more. It is important that patients speak with their healthcare professional before stopping taking medical nutrition.

References

1. Fearon K et al. Lancet Oncol, 2011;12(5):489-95.

2. Ryan et al. Proc Nutr Soc. 2016;75(2):199-211.

3. Andreyev HJ et al. Eur J Cancer. 1998;34(4)p.503-9.

4. Prado CM et al. Cancer Chemother Pharmacol, 2011; 67(1):p.93-101.

5. Fearon KC. Eur J Cancer 2008;44(8): p.1124-32.

6. Arends J, et al. ESPEN guidelines on nutrition in cancer patients. Clin Nutr, 2016;ePub Curr Opin

     Support Palliat Care. 2013 Sep; 7(3): 272-277. Vitamin D in the cancer patient.

7. Kurt A. Kennel and Matthew T. Drake

8. Burden ST, et al. J Cachexia Sarcopenia Muscle, 2017.

9. Baldwin et al. J Natl Cancer Inst, 2012;104(5):371-385.

10. Kabata P, et al. Support Cancer Care, 2015; 23(2):365-70.

11. Manasek V. et al. Klin Onkol, 2016.

12. Martin L Senesse P et al. J Clin Oncol 2015 Jan 1: 33(1):p.90-9.

13. De Waele et al. Appetite, 2016;91:298-301.

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